JP6593038B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine including a rotor in which a plurality of salient pole portions wound with a coil interlinked with magnetic flux generated on a stator side are arranged in the circumferential direction.

  As a rotating electrical machine mounted on a hybrid vehicle or the like, a stator having an armature coil that generates a magnetic flux by energization, and a rotor in which a plurality of salient pole portions wound with a coil interlinking magnetic flux are arranged in the circumferential direction, Is used. In such a rotating electrical machine in which a coil is wound around a salient pole of a rotor, a large centrifugal force acts on the coil when the rotor rotates, and thus the coil may unintentionally jump out of the slot of the rotor.

  On the other hand, what was described in patent document 1 is known as a conventional rotary electric machine. In the rotating electrical machine described in Patent Document 1, a T-shaped holding member is provided between adjacent salient poles in order to prevent unintentional jumping of the coil from the slot of the rotor.

  The holding member includes a leg portion that extends radially outward of the rotor, and a beam portion that extends from the outer peripheral side end portion of the leg portion to both sides in the circumferential direction of the rotor to support the coil from the outer peripheral side. In addition, the end of the inner peripheral side of the leg is locked to the rotor core, and the end of the beam is locked to the salient pole of the rotor, thereby preventing unintentional coil jumping out of the rotor slot. . In this holding member, the beam portion and the leg portion are formed thick so that the coil can be reliably held against the centrifugal force.

JP 2014-054067 A

  However, since the conventional rotating electric machine described in Patent Document 1 has thick beam portions and leg portions of the holding member, if the occupancy rate of the beam portions and leg portions of the rotor is large, the coil occupancy rate is small. Thus, there is a problem that an appropriate torque cannot be obtained.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotating electrical machine that can secure a occupancy ratio of a coil of a rotor and suppress a decrease in torque, and can prevent unintentional jumping of a coil from a rotor slot by a holding member. It is said.

According to one aspect of the invention of a rotating electrical machine that solves the above problem, a stator having an armature coil that generates a magnetic flux when energized, and a plurality of salient pole portions around which the coil that links the magnetic flux is wound are arranged in parallel in the circumferential direction. an electric motor comprising a rotor are, and includes an insulating paper that will be disposed between the salient poles adjacent each other of said rotor, said insulating sheet includes a support portion supported by the salient pole portion, wherein connected to the support portion and a leg portion supported by the bottom of the rotating shaft side between the salient poles, a coil wound on the rotor, fixed by solidifying material liquid, the insulating paper, It is arrange | positioned between the coils wound on the said rotor adjacent to the circumferential direction, and the circumferential direction side surface and said leg part of each coil wound on the said rotor adjacent to the circumferential direction are being fixed with the said solidification material. It is characterized by.

  According to the present invention, it is possible to secure the occupancy ratio of the coil of the rotor and suppress a decrease in torque, and to prevent unintentional jumping of the coil from the slot of the rotor by the holding member.

FIG. 1 is a diagram showing a rotating electrical machine according to an embodiment of the present invention, and is a cross-sectional view orthogonal to a rotation axis showing a half model of the schematic configuration. FIG. 2 is a connection diagram illustrating a closed connection circuit of a diode installed in the inner rotor. FIG. 3 is a cross-sectional view parallel to the rotation axis of the rotating electrical machine according to the embodiment of the present invention. FIG. 4 is an exploded perspective view showing the outer rotor of the rotating electrical machine according to the embodiment of the present invention. FIG. 5 is an exploded perspective view showing the inner rotor of the rotating electrical machine according to the embodiment of the present invention. FIG. 6 is a view showing the rotating electrical machine according to the embodiment of the present invention, and is a front view of the rotor winding of the inner rotor as seen from the other end side in the axial direction. FIG. 7 is a view showing the rotating electrical machine according to the embodiment of the present invention, and is a perspective view of the insulator after the rotor windings are arranged. FIG. 8 is a view showing the rotating electrical machine according to the embodiment of the present invention, and is a perspective view of the insulator before the rotor winding is arranged. FIG. 9 is a view showing the rotating electrical machine according to the embodiment of the present invention, and is a cross-sectional view of the inner rotor in a cross section orthogonal to the rotation axis after the holding member is assembled. FIG. 10 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of a holding member formed by molding insulating paper. FIG. 11 is a view illustrating the rotating electrical machine according to the embodiment of the present invention, and is a cross-sectional view of the inner rotor in a cross section orthogonal to the rotation axis before the holding member is assembled. FIG. 12 is a view showing the rotating electrical machine according to the embodiment of the present invention, and is a perspective view of the inner rotor when the holding member is assembled from the other end side in the axial direction.

  Embodiments of the present invention will be described below with reference to the drawings. 1-12 is a figure explaining the rotary electric machine which concerns on one embodiment of this invention.

  In FIG. 1, a rotating electrical machine 1 is configured as a double rotor type rotating electrical machine, and has a stator 100 formed in a cylindrical shape and a second rotor provided on the rotating shaft 1 </ b> C side from the stator 100. The outer rotor 200 and an inner rotor 300 as a first rotor provided on the rotating shaft 1C side with respect to the outer rotor 200 are provided. The outer rotor 200 and the inner rotor 300 are supported so as to be relatively rotatable about the rotation shaft 1C as a rotation center. FIG. 1 is a radial sectional view of 180 degrees (1/2) of the mechanical angle of 360 degrees. The inner rotor 300 constitutes a rotor in the present invention.

  The stator 100 includes a stator core 101, and a plurality of stator teeth 102 extending in the radial direction toward the axis are arranged in parallel in the circumferential direction. The stator teeth 102 are formed so as to face the outer peripheral surface 201a of a magnetic path member 201 of the outer rotor 200, which will be described later, with the inner peripheral surface 102a facing the air gap G1.

  In this stator 100, armature coils 104 corresponding to the W-phase, V-phase, and U-phase of three-phase alternating current are housed with the slot 103 between the side surfaces 102b of the stator teeth 102. The armature coil 104 is wound around the stator teeth 102 by distributed winding. The armature coil 104 generates a magnetic flux when energized.

  When the three-phase alternating current is supplied to the armature coil 104, the stator 100 generates a rotating magnetic field that rotates in the circumferential direction, and links the generated magnetic flux to the outer rotor 200 and the inner rotor 300, thereby the outer rotor 200 and Each of the inner rotors 300 is driven to rotate.

  The outer rotor 200 includes a magnetic path member 201 made of a soft magnetic material such as steel having a high magnetic permeability, and a nonmagnetic member 202 made of a nonmagnetic material that does not pass magnetic flux such as PPS (polyphenylene sulfide) resin. The magnetic path member 201 and the nonmagnetic member 202 are extended in the axial direction. The axial direction indicates the same direction as the direction in which the rotating shaft 1C extends.

  The magnetic path member 201 has a pole piece portion 201A that faces the nonmagnetic member 202 in the circumferential direction, and a bridge portion 201B that connects adjacent pole piece portions 201A on the stator side and the inner rotor side of the nonmagnetic member 202.

  The pole piece portion 201A and the bridge portion 201B are integrally formed. Therefore, the magnetic path member 201 is configured as an integral core in which the pole piece portion 201A and the bridge portion 201B are integrally formed. The magnetic path member 201 configured as an integral core is formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  The nonmagnetic member 202 is provided in a space surrounded by the pole piece portion 201A and the bridge portion 201B. Therefore, in the outer rotor 200 of the present embodiment, the soft magnetic pole piece portions 201A and the nonmagnetic members 202 are alternately arranged in the circumferential direction. Detailed configurations of the magnetic path member 201 and the nonmagnetic member 202 will be described later.

  In the outer rotor 200, the outer peripheral surface 201a and the inner peripheral surface 201b of the magnetic path member 201 face the inner peripheral surface 102a of the stator teeth 102 of the stator 100 and the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300 described later. It is formed as follows.

  In the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 passes through the pole piece portion 201 </ b> A of the magnetic path member 201 efficiently, while the nonmagnetic member 202 prevents the magnetic flux from passing therethrough. After passing through the pole piece portion 201A of the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 is interlinked with the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300, as will be described later. A magnetic circuit returning to the stator 100 is formed by passing through the pole piece portion 201 </ b> A of the outer rotor 200.

  At this time, since the outer rotor 200 rotates relative to the stator 100, the pole piece portion 201A of the magnetic path member 201 that passes the magnetic flux and the nonmagnetic member 202 that restricts the passage of the magnetic flux are repeatedly switched to change the magnetic circuit. Form.

  As the outer rotor 200 rotates in this manner, the number and frequency of the rotating magnetic field generated by the armature coil 104 can be changed. Torque is generated by the synchronous rotation of the modulated rotating magnetic field and the inner rotor 300.

  The inner rotor 300 includes a rotor core 301 in which a plurality of electromagnetic steel plates are laminated in the axial direction. In the rotor core 301, a plurality of rotor teeth (saliency pole portions) 302 extending in the radial direction separated from the shaft center are arranged in parallel in the circumferential direction. The rotor teeth 302 are formed so that the outer peripheral surface 302a faces the inner peripheral surface 201b of the magnetic path member 201 of the outer rotor 200 via the air gap G2.

  The rotor teeth 302 have a rotor winding 330 composed of an induction coil I and a field coil F. The induction coil I is wound around the outer rotor 200 side of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. The field coil F is wound around the axial center of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. That is, the induction coil I is wound on the radially outer side of the inner rotor 300 in the slot 303, and the field coil F is wound on the radially inner side of the inner rotor 300 in the slot 303. The rotor winding 330 composed of the induction coil I and the field coil F constitutes a coil in the present invention.

  The induction coil I is formed in a concentrated winding in which each adjacent rotor coil 302 forms a circumferential winding whose direction is opposite to each other in the circumferential direction of the inner rotor 300, and is arranged in the circumferential direction of the inner rotor 300. The induction coil I generates (induces) an induced current by interlinking of magnetic flux.

The field coils F are formed so as to be concentrated windings in which the adjacent windings are opposite to each other in the circumferential direction of the inner rotor 300 for each rotor tooth 302, and are arranged in the circumferential direction of the inner rotor 300. The field coil F is excited by being supplied with a field current and functions as an electromagnet.
Thus, the induction coil I and the field coil F are wound so that the current directions are equal.

  Here, the eight induction coils I corresponding to the mechanical angle of 180 degrees in FIG. 1 are distinguished from each other by calling them induction coils I1 to I8 in the rotation direction (counterclockwise direction). In addition, eight field coils F corresponding to a mechanical angle of 180 degrees are distinguished from each other by being called field coils F1 to F8 in the rotation direction.

  In FIG. 2, induction coils I1, I3, I5, I7 and field coils F1, F2, F3, F4 together with diodes D1, D2 form a rectifier circuit C1, which is a closed circuit. In this rectifier circuit C1, every third induction coil I1, I5 and diode D1 are connected in series, every third induction coil I3, I7 and diode D2 are connected in series, and field coils F1, F2, F3, F4. Are connected in series. In addition, the series connection consisting of induction coils I1 and I5 and diode D1 and the series connection consisting of induction coils I3 and I7 and diode D2 are connected in parallel at both ends, and then the field coil on the cathode side of diodes D1 and D2. It is connected to a series connection composed of F1, F2, F3, and F4. In this way, the rectifier circuit C1 rectifies the alternating induction current generated in the induction coils I1, I3, I5, and I7 in one direction by the diodes D1 and D2, respectively, and directs the current to the field coils F1, F2, F3, and F4. The circuit configuration is wired so as to supply the field current.

  The induction coils I2, I4, I6, and I8 and the field coils F5, F6, F7, and F8 together with the diodes D3 and D4 form a rectifier circuit C2 that is a closed circuit. In this rectifier circuit C2, every third induction coil I2, I6 and diode D3 are connected in series, every third induction coil I4, I8 and diode D4 are connected in series, and field coils F5, F6, F7, F8. Are connected in series. In addition, the series connection including the induction coils I2, I6 and the diode D3 and the series connection including the induction coils I4, I8 and the diode D4 are connected in parallel at both ends, and then the field coil F5 on the cathode side of the diodes D3 and D4. , F6, F7, F8 are connected in series. As described above, the rectifier circuit C2 rectifies the AC induced current generated in the induction coils I2, I4, I6, and I8 in one direction by the diodes D3 and D4, respectively, and directs the current to the field coils F5, F6, F7, and F8. The circuit configuration is wired so as to supply the field current.

  With this circuit configuration, the induction current generated by the induction coil I can be rectified and the field coil F can be excited as a field current, so that the rotor teeth 302 can function as an electromagnet.

  Here, even when the induction coils I and the field coils F are multipolarized, the number of diodes D1, D2, D3, and D4 is reduced by using a series connection, and in order to avoid mass use, Rather than forming an H-bridge type full-wave rectifier circuit, the neutral-point-clamped half-wave rectifier outputs a half-wave rectified output by inverting one of the induction currents so that each phase is 180 degrees. A circuit is formed.

  In the field coils F of the rectifier circuits C1 and C2, the winding directions of the adjacent rotor teeth 302 are reversed. Accordingly, one rotor tooth 302 of the inner rotor 300 that constitutes a part of the magnetic circuit is magnetized so as to function as an electromagnet that faces the south pole that is directed from the pole piece portion 201A of the outer rotor 200. . Further, another adjacent rotor tooth 302 is magnetized so as to function as an electromagnet that faces the N pole in a direction in which magnetic flux is guided to the outer rotor 200 side.

  Here, the principle of torque generation of the rotating electrical machine 1 will be described. In the inner rotor 300, among the magnetic fluxes linked from the stator 100 via the outer rotor 200, the magnetic flux modulated by the rotation of the outer rotor 200 is linked in synchronization with the rotation of the inner rotor 300.

  On the other hand, in the rotating electrical machine 1, the magnetic flux interlinked with the induction coil I of the inner rotor 300 includes a component that varies without being modulated by the outer rotor 200 (not synchronized with the rotation of the inner rotor 300). As a result, an alternating induction current can be generated in the induction coil I. Then, the AC induced current is rectified by the diodes D1 and D2 to be a DC field current, and the field coil F is energized to cause the rotor teeth 302 to function as an electromagnet to generate a field magnetic flux. it can. In this way, the rotating electrical machine 1 can generate torque.

  At this time, the magnetic flux interlinking from the stator teeth 102 of the stator 100 to the rotor teeth 302 of the inner rotor 300 through the pole piece portion 201A of the outer rotor 200 is supplied from the AC power source to the distributed armature coil 104. generate.

  By the way, this armature coil 104 employs distributed winding in the present embodiment, but may employ concentrated winding. When concentrated winding is employed, more harmonic components can be superimposed on the magnetic flux interlinking with the rotor teeth 302 than when generated by a distributed winding coil. Since the harmonic component superimposed on the magnetic flux acts as a fluctuation in the amount of magnetic flux, an induction current can be effectively generated in the induction coil I, and a larger field current is supplied to the field coil F. Field magnetic flux can be generated.

  For these reasons, the rotating electrical machine 1 can relatively rotate the inner rotor 300 with electromagnet torque (rotational force) without providing a permanent magnet. In the inner rotor 300, the rotor teeth 302 function as electromagnets arranged in parallel so that the magnetization directions (N pole and S pole) are alternated in the circumferential direction, whereby a chain is formed between the outer rotor 200 and the stator 100. The magnetic flux to be exchanged can be passed around the slot 303 smoothly.

  In this rotating electrical machine 1, the outer rotor 200 rotates relative to the stator 100, and the inner rotor 300 to which the magnetic flux passing through the rotating outer rotor 200 (magnetic path member 201) is linked is rotated relative to the electromagnet torque. Therefore, the outer rotor 200 can be rotated at a low speed, and the inner rotor 300 can be rotated at a high speed. Conversely, the outer rotor 200 can be rotated at a high speed and the inner rotor 300 can be rotated at a low speed.

In the rotating electrical machine 1, torque necessary for the above-described rotational drive is generated according to the structure of the stator 100, the outer rotor 200, and the inner rotor 300. Specifically, the number of pole pairs of the armature coil 104 of the stator 100 is A, the number of pole piece parts 201A that is the number of poles of the outer rotor 200 is H, and the rotor teeth (electromagnet) 302 that is the number of pole pairs of the inner rotor 300 When the number of pole pairs is P, the following formula (1) is established.
H = | A ± P | (1)

  With this structure, it is possible to effectively generate torque and to efficiently rotate the outer rotor 200 and the inner rotor 300 relative to the stator 100. For example, in the rotating electrical machine 1 of the present embodiment, the number of pole pairs A = 4 of the armature coil 104 of the stator 100, the number of poles H = 12 of the outer rotor 200, and the number of pole pairs P = 8 of the rotor teeth 302 of the inner rotor 300. Yes, the above equation (1) is satisfied.

  As shown in FIG. 3, in the rotating electrical machine 1, an outer rotor 200 is rotatably accommodated in a stator 100, and an inner rotor 300 is rotatably accommodated in the outer rotor 200.

  Further, an outer rotating shaft 210 is coupled to the magnetic path member 201 of the outer rotor 200 so as to be integrally rotatable. An inner rotary shaft 310 is coupled to the rotor core 301 of the inner rotor 300 so as to be integrally rotatable. Thereby, the rotary electric machine 1 is configured as a magnetic modulation type biaxial motor capable of transmitting power to each of the outer rotary shaft 210 and the inner rotary shaft 310 using the magnetic modulation principle.

  Therefore, the rotating electrical machine 1 can function, for example, the stator 100 as a sun gear of a planetary gear mechanism, the outer rotor 200 as a carrier of a planetary gear mechanism, and the inner rotor 300 as a ring gear of the planetary gear mechanism, and is equivalent to a mechanical planetary gear mechanism. A function can be provided. The rotating electrical machine 1 according to the present embodiment is configured such that the outer rotor 200 functions as a carrier.

  With this structure, for example, when the rotating electrical machine 1 is mounted as a drive source together with an engine (internal combustion engine) in a hybrid vehicle, the outer rotating shaft 210 of the outer rotor 200 and the inner rotating shaft 310 of the inner rotor 300 are respectively connected to the power transmission path of the vehicle. By connecting directly to the armature coil 104 of the stator 100 via an inverter, it is possible to function as a power transmission mechanism together with the drive source.

(Outer rotor)
3 and 4, the outer rotor 200 includes an outer rotating shaft 210 made of iron, an annular flange 215, and a cylindrical cylindrical shaft 214 in addition to the magnetic path member 201 and the nonmagnetic member 202 described above. I have.

  The outer rotating shaft 210 includes a cylindrical small-diameter portion 210A and a flange-shaped large-diameter portion 210B continuous with the other end of the small-diameter portion 210A. The large-diameter portion 210B is formed such that the radial direction around the rotation shaft 1C is larger than the radial direction of the small-diameter portion 210A, and faces the magnetic path member 201 on the other end side in the axial direction.

  A resolver ring 221, a resolver rotor 220, and a retainer 218 are provided in the small diameter portion 210 </ b> A of the outer rotating shaft 210 from one end portion in the axial direction toward the other end portion. The resolver rotor 220 is fixed to the small diameter portion 210 </ b> A by a resolver ring 221 so as to be integrally rotatable.

  The retainer 218 is formed in an annular shape, and supports an outer ring of a radial ball bearing 21 to be described later on a side surface on one end side in the axial direction of an inner edge portion thereof. Further, the retainer 218 is provided with a nut portion 218A, and a bolt 26 described later is screwed into the nut portion 218A.

  The flange 215 is provided between the large diameter portion 210 </ b> B of the outer rotating shaft 210 and the magnetic path member 201 and the nonmagnetic member 202. The flange 215 is made of a nonmagnetic material such as an aluminum material. As a result, the magnetic flux generated by the armature coil 104 is prevented from flowing as a leakage magnetic flux to the outer rotary shaft 210 made of iron.

  A plurality of insertion holes 210B1 and 215A arranged in the circumferential direction are respectively formed in the large diameter portion 210B and the flange 215, and a non-magnetic bolt 219 is inserted through these insertion holes 210B1 and 215A. An insertion hole 202A is formed in the nonmagnetic member 202, and a nonmagnetic bolt 219 is inserted into the insertion hole 202A.

  The nonmagnetic bolt 219 is made of a nonmagnetic material that does not pass magnetic flux, such as PPS (polyphenylene sulfide) resin. For this reason, in the outer rotor 200, each pole piece portion 201A (see FIG. 1) is magnetically independent, and the permeance variation (saliency pole) by each pole piece portion 201A is compared with the case where the non-magnetic bolt 219 is made of a magnetic material. Ratio) can be increased. Thereby, the torque density in the rotary electric machine 1 is improved.

  Further, since the nonmagnetic bolt 219 is made of a nonmagnetic material, eddy current generated in the nonmagnetic bolt 219 due to the harmonic magnetic flux generated in the gap and generated between the nonmagnetic bolts 219. Loss due to eddy currents can be reduced.

  The cylindrical shaft 214 is provided on the other end side in the axial direction of the magnetic path member 201 and the nonmagnetic member 202 (left end side in FIG. 3). The cylindrical shaft 214 includes an axis of the nonmagnetic bolt 219. A female screw 214A is formed to which the other end in the direction is screwed.

  The cylindrical shaft 214 is made of, for example, nonmagnetic stainless steel. As a result, the magnetic flux generated by the armature coil 104 is prevented from flowing to the outside as a leakage magnetic flux via the cylindrical shaft 214.

  In the outer rotor 200, the nonmagnetic bolt 219 is sequentially inserted from the other end side in the axial direction into the insertion hole 210 </ b> B <b> 1 of the large diameter portion 210 </ b> B, the insertion hole 215 </ b> A of the flange 215, and the insertion hole 202 </ b> A of the nonmagnetic member 202. The flange 215 and the outer rotary shaft 210 are fixed to one end side in the axial direction of the magnetic path member 201 and the nonmagnetic member 202 (right end side in FIG. 3), and the magnetic path A cylindrical shaft 214 is fixed to the other end side in the axial direction of the member 201 and the nonmagnetic member 202.

(Inner rotor)
3 and 5, the inner rotor 300 includes an inner rotating shaft 310 made of iron. On the outer periphery of the inner rotary shaft 310, the balance plate 311, the spacer 312, the rotor winding 330, the spacer 314, the diode holder 315, the balance plate 316, U are arranged from one end to the other end in the axial direction. A nut 317, a retainer 318, a resolver rotor 319, and a resolver ring 320 are provided.

  The balance plate 311 is made of an iron material formed in an annular shape, and is positioned in the axial direction by the flange portion of the inner rotary shaft 310 at the inner peripheral edge portion. The balance plate 311 supports the rotor winding 330 via a spacer 312 from one end side (right end side in FIG. 3) of the rotor winding 330 in the axial direction.

  The spacer 312 is interposed between the axial end of the rotor winding 330 and the balance plate 311. The spacer 312 is formed such that the radial direction around the rotating shaft 1 </ b> C is smaller than the radial direction of the rotor winding 330, and a space is formed between the rotor winding 330 and the balance plate 311. The spacer 312 is made of an aluminum material formed in an annular shape. The balance plate 311 and the spacer 312 are prevented from rotating with respect to the inner rotary shaft 310 so as to rotate integrally with the rotor winding 330.

  The balance plate 316 is made of an iron material formed in an annular shape, and is positioned in the axial direction by a U nut 317 at the inner peripheral edge. The balance plate 316 supports the rotor winding 330 via the diode holder 315 and the spacer 314 from the other end side in the axial direction of the rotor winding 330 (left end side in FIG. 3).

  The spacer 314 is interposed between the other end portion in the axial direction of the rotor winding 330 and the diode holder 315. The spacer 314 has a smaller radial dimension around the rotation axis 1 </ b> C than the rotor winding 330, and forms a space between the rotor winding 330 and the diode holder 315. The spacer 314 is made of an aluminum material formed in an annular shape.

  The diode holder 315 is made of a circuit board formed in an annular shape, and holds the aforementioned diodes D1 to D4. The balance plate 316, the diode holder 315, and the spacer 314 are prevented from rotating with respect to the inner rotary shaft 310 so as to rotate integrally with the rotor winding 330.

  The U nut 317 has a female screw (not shown) formed on the inner peripheral surface thereof, and is screwed to a male screw (not shown) formed on the outer peripheral surface of the inner rotary shaft 310. When the U nut 317 is screwed to the inner rotating shaft 310, the rotor winding 330 is sandwiched from both sides in the axial direction by the balance plates 311 and 316 via the spacers 312 and 314 and the diode holder 315. The rotation axis 310 is fixed in the axial direction and the rotation direction.

  The retainer 318 is formed in an annular shape, and supports an outer ring of a radial ball bearing 23 described later on the side surface of the inner edge portion on the other end side in the axial direction (left end side in FIG. 3). A nut portion 318A is provided on one end side (right end side in FIG. 3) of the outer edge portion of the retainer 318 in the axial direction, and a bolt 25 described later is screwed into the nut portion 318A. .

(Overall structure including case)
In FIG. 3, the rotating electrical machine 1 includes a case 10 in which the above-described stator 100, outer rotor 200, and inner rotor 300 are accommodated.

  The case 10 includes a first flange 11, a first spacer 12, a first case 13, a second case 14, a second spacer 15, and a second flange 16 from one end side in the axial direction toward the other end side. ing.

  The first case 13 includes a disc-shaped plate portion 13A and a cylindrical cylindrical portion 13B continuous to the other end side of the outer edge portion of the plate portion 13A. A through hole 13C is formed at the center of the plate portion 13A, and a small diameter portion 210A of the outer rotating shaft 210 passes through the through hole 13C.

  A stator 100 is fixed to the inner peripheral surface of the cylindrical portion 13B. The cylindrical portion 13 </ b> B faces the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200 and the rotor core 301 and the rotor winding 330 of the inner rotor 300 in the radial direction.

  Thus, on the radially inner side of the cylindrical portion 13B, the stator 100 that is the main portion of the rotating electrical machine 1, the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200, the rotor core 301 of the inner rotor 300, and the rotor windings. 330 is accommodated.

  A radial ball bearing 21 is provided in the through hole 13C. The radial ball bearing 21 is positioned in the axial direction by inserting a bolt 26 into the plate portion 13A of the first case 13 from one end in the axial direction and screwing it into the nut portion 218A of the retainer 218. The plate portion 13 </ b> A of the first case 13 supports the small-diameter portion 210 </ b> A of the outer rotating shaft 210 via the radial ball bearing 21 so as to be rotatable.

  A resolver sensor 31 is fixed in the through hole 13C. On the other hand, an annular resolver rotor 220 is provided on the small diameter portion 210 </ b> A of the outer rotating shaft 210 so as to face the resolver sensor 31 in the radial direction. The resolver rotor 220 is fixed to the small-diameter portion 210 </ b> A of the outer rotating shaft 210 by a resolver ring 221 so as to be integrally rotatable.

  The resolver sensor 31 detects the rotation angle of the outer rotor 200 by detecting the rotation angle of the resolver rotor 220.

  The second case 14 includes a cylindrical outer cylinder portion 14A, a cylindrical inner cylinder portion 14B disposed on the inner peripheral side of the outer cylinder portion 14A, and the axial direction of the outer cylinder portion 14A and the inner cylinder portion 14B. It has a disc-shaped plate portion 14C continuous on the other end side.

  The first case 13 and the second case 14 are formed by attaching the cylindrical portion 13B of the first case 13 and the outer cylindrical portion 14A of the second case 14 together in the axial direction and fastening them with bolts (not shown). 200 and the inner rotor 300 are connected.

  The outer cylinder portion 14 </ b> A is opposed to the other end portion in the axial direction of the cylindrical shaft 214 of the outer rotor 200 in the radial direction, and supports the cylindrical shaft 214 rotatably via the radial ball bearing 22.

  Here, the outer rotor 200 of the present embodiment has a cup-type structure in which the magnetic path member 201 and the nonmagnetic member 202 are fixed to the large diameter portion 210B of the outer rotating shaft 210 on one end side in the axial direction. .

  When the cup-shaped outer rotor 200 is cantilevered with respect to the first case 13, for example, when natural vibration occurs, the electromagnetic attraction acting on the outer rotor 200 and the natural vibration of the outer rotor 200 resonate. When an excessive force is applied, electromagnetic vibration becomes large. In addition, when the outer rotor 200 is driven eccentrically, an excessive load is applied to the radial ball bearing that is cantilevered, which affects the durability of the radial ball bearing.

  Therefore, in the present embodiment, the other end side in the axial direction of the outer rotor 200, that is, the cylindrical shaft 214 is positioned in the radial direction around the rotation shaft 1 </ b> C rather than the radial ball bearing 21 supporting the outer rotation shaft 210. It was set as the structure supported with respect to the 2nd case 14 by the radial ball bearing 22 with a big dimension.

  As a result, the outer rotor 200 of the present embodiment can have a both-end support structure, which prevents an increase in electromagnetic vibration as described above and an excessive load on the radial ball bearing 21 due to the eccentric drive. can do.

  A resolver sensor 32 is fixed to the inner periphery of the inner cylinder portion 14B. On the other hand, the inner rotary shaft 310 is provided with an annular resolver rotor 319 so as to face the resolver sensor 32 in the radial direction. The resolver rotor 319 is fixed to the inner rotation shaft 310 by a resolver ring 320 so as to be integrally rotatable.

  The resolver sensor 32 detects the rotation angle of the inner rotor 300 by detecting the rotation angle of the resolver rotor 319.

  A radial ball bearing 23 is provided on the inner circumference of one end portion in the axial direction of the inner cylinder portion 14B. The radial ball bearing 23 is positioned in the axial direction by inserting a bolt 25 from the other end in the axial direction into the inner cylinder portion 14B and screwing it into the nut portion 318A of the retainer 318. The inner cylindrical portion 14 </ b> B of the second case 14 rotatably supports the inner rotary shaft 310 via the radial ball bearing 23.

  A radial ball bearing 24 is provided on the inner periphery of the large-diameter portion 210B of the outer rotating shaft 210. The large-diameter portion 210B rotatably supports one end portion of the inner rotary shaft 310 via the radial ball bearing 24.

  A through hole 12A is formed in the first spacer 12, and a wiring 31A extending from the resolver sensor 31 passes through the through hole 12A. Further, the first spacer 12 is interposed between the first case 13 and the first flange 11, thereby ensuring a space through which the wiring 31 </ b> A passes between the first case 13 and the first flange 11. ing.

  A through-hole 15A is formed in the second spacer 15, and a wiring 32A extending from the resolver sensor 32 passes through the through-hole 15A. Further, the second spacer 15 is interposed between the second case 14 and the second flange 16, so that a space through which the wiring 32 </ b> A passes is secured between the second case 14 and the second flange 16. ing.

  The first flange 11 is fixed to one end of the first case 13 in the axial direction by a bolt (not shown) via a cylindrical first spacer 12. The first flange 11 is formed in a flange shape having a larger radial dimension around the rotation shaft 1C than the first case 13, and is fixed to the vehicle body by a bolt (not shown).

  On the inner peripheral side of the first flange 11, a coupling 33 is provided at one end portion in the axial direction of the small diameter portion 210 </ b> A of the outer rotating shaft 210. For example, a vehicle drive shaft (not shown) is coupled to the small diameter portion 210 </ b> A of the outer rotating shaft 210 via a coupling 33. The rotation of the outer rotating shaft 210 is transmitted to the drive shaft of the vehicle through this coupling 33.

  On the other end side in the axial direction of the second case 14, a second flange 16 is fixed by a bolt (not shown) via a cylindrical second spacer 15. The second flange 16 is formed in a flange shape having a larger radial dimension around the rotation shaft 1C than the second case 14, and is fixed to the vehicle body by a bolt (not shown).

On the inner peripheral side of the second flange 16, a coupling 34 is provided at the other end of the inner rotor 300 in the axial direction of the inner rotating shaft 310. The engine output shaft is not connected. Engine rotation is transmitted to the inner rotating shaft 310 via the coupling 34.
In the rotating electrical machine 1 of the present embodiment, a vehicle drive shaft is connected to the outer rotating shaft 210, and an engine output shaft is connected to the inner rotating shaft 310, but as a rotating electrical machine of other embodiments, An engine output shaft may be connected to the outer rotating shaft 210, and a vehicle driving shaft may be connected to the inner rotating shaft 310.

(About insulators)
In the rotary electric machine 1 configured as described above, when the inner rotor 300 is directly connected to the output shaft of the engine, the vibration of the engine is transmitted to the inner rotor 300 through the output shaft, and the rotor winding 330 of the inner rotor 300 vibrates. In particular, the rotor winding 330 vibrates greatly when resonance occurs.

  When the rotor winding 330 vibrates, the film of the rotor winding 330 may be rubbed and broken with the rotor teeth 302 made of an electromagnetic steel plate. When the film of the rotor winding 330 is broken, the rotor winding 330 is grounded.

  Therefore, in the present embodiment, in FIG. 6, the inner rotor 300 includes an insulator 340 made of a resin having electrical insulation between the rotor teeth 302 and the rotor winding 330.

  The insulator 340 holds the rotor winding 330 in a state of being wound outward in advance, and is attached to each rotor tooth 302. As a result, the rotor winding 330 is not in direct contact with the rotor teeth 302, and the coating of the rotor winding 330 is prevented from rubbing against the rotor teeth 302 and breaking. In the present embodiment, the rotor teeth 302 are not provided with a flange portion at the tip, unlike the rotor teeth of a conventional rotating electric machine, and the tip portion and the base portion have the same cross-sectional shape or are formed so as to expand gently. ing.

  As a result, out of the magnetic flux generated in the stator 100 and interlinked with the induction coil I of the inner rotor 300, the asynchronous magnetic flux that fluctuates without synchronizing with the rotation of the inner rotor 300 is prevented from being blocked by the flange portion of the rotor teeth 302. Inductive current can be efficiently generated in the induction coil I. Further, the insulator 340 can be attached to the rotor teeth 302 from the outside in the radial direction.

  Hereinafter, a detailed configuration of the insulator 340 will be described. 7 and 8, the insulator 340 includes a cylindrical portion 341 that serves as a shaft around which the rotor winding 330 is wound, and a flange portion 342 that is provided at the outer end in the rotor radial direction of the cylindrical portion 341.

  An induction coil I is wound around the outer side of the cylindrical portion 341 in the rotor radial direction with a gap from the flange portion 342. A field coil F is wound around the inner circumferential side of the cylindrical portion 341 in the rotor radial direction.

  The cylindrical portion 341 is provided with a fitting hole 341A having a rectangular cross-sectional shape, and the fitting hole 341A is formed to have a dimension that allows the rotor teeth 302 to be fitted without a gap.

  The flange portion 342 is formed to extend in the circumferential direction along the outer peripheral surface of the inner rotor 300 from the end portion of the cylindrical portion 341 on the outer side in the rotor radial direction. Further, the flange portion 342 extends in the axial direction, and the extending portion has a length in the axial direction larger than the length in the circumferential direction.

  The insulator 340 is attached to the rotor teeth 302 from the outside in the radial direction by fitting the rotor teeth 302 into the fitting holes 341A in a cassette bobbin state in which the induction coil I and the field coil F are wound. The

  In this manner, the insulator 340 can be attached to the rotor teeth 302 of the rotor core 301 from the outside in the radial direction in a state where the rotor winding 330 is wound, and has a so-called cassette bobbin structure. Therefore, in addition to the effect that the film of the rotor winding 330 is protected, there is also an effect that the assembling property of the inner rotor 300 is improved.

  In the present embodiment, the insulator 340 includes an intermediate rib 343 that partitions the region where the induction coil I is wound from the region where the field coil F is wound. The intermediate rib 343 is formed so as to extend from the cylindrical portion 341 to the slot 303 in the same manner as the flange portion 342.

  Further, the insulator 340 has an inner rib 344 closer to the rotation shaft 1C than the intermediate rib 343. The inner rib 344 is formed so as to extend from the inner peripheral portion of the cylindrical portion 341 in the rotor radial direction to the slot 303 similarly to the flange portion 342, and partitions the region around which the field coil F is wound.

(About the holding member.)
In the rotating electrical machine 1 configured as described above, when the inner rotor 300 rotates, a large centrifugal force acts on the rotor winding 330 disposed in the insulator 340, so that the rotor winding 330 is radially outward by the centrifugal force. It is necessary to prevent misalignment or unintentional pop-out. Therefore, the inner rotor 300 includes a T-shaped holding member 350 that supports the rotor winding 330 against a centrifugal force.

  9 and 10, the holding member 350 is formed in a T-shaped cross-sectional shape and is disposed in the slot 303 of the inner rotor 300.

  The holding member 350 is disposed between the adjacent rotor teeth 302 of the inner rotor 300, and is supported on the rotor teeth 302 side. The holding member 350 is connected to the support portion 352, and is on the rotating shaft 1 </ b> C side between the rotor teeth 302. And a leg 351 supported at the bottom.

  The support portion 352 is formed in a plate shape, and extends in a beam shape from the radially outer end of the leg portion 351 to both sides in the circumferential direction. The leg portion 351 is formed in a plate shape and extends in the radial direction. The leg portion 351 has a length that is substantially the same as the overall length of the rotor core 301 in the axial direction or slightly shorter than the overall length in the axial direction.

  The leg portion 351 is provided with a plate-like slit insertion portion 353, and the slit insertion portion 353 extends from the radially inner end of the leg portion 351 to both sides in the circumferential direction. The slit insertion part 353 is formed shorter than the support part 352.

  9 and 11, the holding member 350 is disposed between the insulators 340 attached to the rotor teeth 302. Specifically, in the rotor core 301 of the inner rotor 300, a slit 304 is formed at the bottom of the slot 303. The slit 304 extends linearly in the circumferential direction and opens into the slot 303 at the center. Yes.

  In this slit 304, the slit insertion portion 353 of the leg portion 351 of the holding member 350 is inserted and held from the axial direction. As described above, the slit 304 for supporting the slit insertion portion 353 of the leg portion 351 is formed in the rotor core 301 at the bottom of the slot 303 instead of the slot 303 in which the rotor winding 330 is disposed, thereby adversely affecting the magnetic circuit. And the occupation ratio of the rotor winding 330 is not reduced.

  Further, a gap is formed between adjacent rotor windings 330, and the leg portion 351 of the holding member 350 is inserted into the gap from the axial direction.

  Further, a gap is formed between the induction coil I of the rotor winding 330 and the flange portion 342 of the insulator 340, and the support portion 352 of the holding member 350 is inserted into the gap from the axial direction.

  Thus, the leg portion 351, the support portion 352, and the slit insertion portion 353 of the holding member 350 are inserted into a very narrow gap. For this reason, the holding member 350 is required to be inserted into the gap in a thin and flexible state during assembly. After insertion into the gap, the holding member 350 has sufficient rigidity and strength to hold the insulator 340 against centrifugal force. Required.

  In order to satisfy such conflicting requirements, the holding member 350 was formed by forming two sheets of insulating paper into a U-shape and then bonding them by heat welding so as to be back to back as shown in FIG. It is composed of a base material which is solidified by impregnating the base material with a liquid solidifying material such as varnish or resin.

  The insulating paper is made of a fibrous or porous material so that a liquid solidified material such as varnish or resin can be sucked by a capillary effect. Insulating paper is a multi-layer laminate structure in which a fibrous sheet (so-called aramid paper) made of aramid resin is bonded to both sides of a fibrous sheet (so-called PET paper) made of PET (polyethylene terephthalate) with an adhesive. Insulating paper can be used. By doing in this way, in addition to a capillary effect, insulation, heat resistance, and mechanical strength can be given to insulating paper. Further, PPS (polyphenylene sulfide) resin may be used as the insulating paper.

  In the preparation process of the holding member 350, the two insulating papers constituting the holding member 350 are formed in a T shape while maintaining flexibility that can be inserted into each of the above-described gaps by bonding by thermal welding.

  In the assembling process of the holding member 350, the insulating paper of the holding member 350 is fitted into each rotor tooth 302 of the rotor core 301 from the other end side in the axial direction as shown in FIG. Thereafter, a liquid solidifying material such as varnish or resin is sealed in the insulating paper. This liquid solidifying agent spreads to each gap by a capillary effect due to a very narrow gap into which the leg portion 351, the support portion 352, and the slit insertion portion 353 of the holding member 350 are inserted. The liquid solidifying agent is sucked into the insulating paper by the capillary effect of the insulating paper. Thereafter, the holding member 350 becomes a member having sufficient rigidity and strength by solidifying the liquid solidifying material.

  Here, the liquid solidifying agent such as varnish or resin is also used for fixing the rotor winding 330. The rotor winding 330 is fixed by injecting a liquid solidified material between the insulators 340 after being mounted on the rotor teeth 302 while being wound around the insulator 340 in advance. Therefore, the step of injecting the liquid solidifying agent into the holding member 350 and the step of injecting the liquid solidifying agent into the rotor winding 330 can be performed simultaneously as one step.

  In the holding member 350 after solidification of the liquid solidifying agent, the support portion 352 is fixed to the flange portion 342 of the insulator 340 and the outer peripheral surface of the induction coil I by the solidifying material, and the outer peripheral surface side of the flange portion 342 and the induction coil I Supported between.

  Further, the slit insertion portion 353 of the leg portion 351 is fixed to and supported by the slit 304 formed at the bottom of the slot 303 of the inner rotor 300 by a solidifying material.

  Thus, not only the holding force by the solidified material at the leg portion 351 inserted in the gap between the adjacent rotor windings 330, but also the holding force at the outer peripheral surface of the flange portion 342 of the insulator 340 and the induction coil I, The holding member 350 and the rotor winding 330 can be held on the inner rotor 300 by the holding force at the portion 351 and the slit insertion portion 353.

  For this reason, the holding member 350 can firmly hold the insulator 340 and the rotor winding 330 against the centrifugal force, and the rotor winding 330 wound around the insulator 340 is prevented from being displaced due to the centrifugal force. .

  In addition, since the insulating paper can be inserted into the gap in a flexible state after molding and heat welding, the assembling process including the inserting operation can be performed smoothly and smoothly.

  Further, since the holding member 350 is made of insulating paper, when the liquid solidifying material such as resin or varnish is sealed in the insulating paper, the strength of the holding member 350 is obtained by the insulating paper sucking and solidifying the solidifying material by a capillary effect. Can be improved.

  In addition, by utilizing the capillary effect of the insulating paper, the insulating paper is solidified by sucking a liquid solidifying agent such as varnish or resin, so that the holding member 350 can be a member having strength, and at low cost. The strength of the holding member 350 can be improved.

  The effect of the rotary electric machine 1 demonstrated as mentioned above is demonstrated. In the rotating electrical machine 1 of the present embodiment, the holding member 350 is disposed between the adjacent rotor teeth 302 of the inner rotor 300, and is supported by the rotor teeth 302 side, and is connected to the support portion 352 and the rotor. Leg portions 351 supported at the bottom of the rotating shaft 1 </ b> C side between the teeth 302.

  The rotor winding 330 wound around the inner rotor 300 is fixed by a liquid solidifying material such as varnish or resin, and the holding member 350 is formed by insulating paper capable of absorbing the liquid solidifying material.

  With this configuration, the rotor winding 330 of the inner rotor 300 is fixed by a liquid solidifying material, and the holding member 350 is formed of insulating paper capable of absorbing the liquid solidifying material, whereby the liquid absorbed by the insulating paper. Since the solidified material is solidified, the coil and the holding member 350 are held together, and the holding member 350 can prevent unintentional jumping of the rotor winding 330 from the slot 303 of the inner rotor 300.

  Further, since the strength of the holding member 350 can be improved by solidifying the solidified material absorbed by the insulating paper, the thickness of the holding member 350 can be reduced, and the coil and the holding member 350 can be integrally held by the liquid solidified material. Therefore, the occupation ratio of the rotor winding 330 in the inner rotor 300 can be ensured, and the decrease in torque can be suppressed.

  As a result, it is possible to prevent the holding member 350 from unintentionally jumping out of the rotor winding 330 from the slot 303 of the inner rotor 300 while ensuring the occupation ratio of the rotor winding 330 of the inner rotor 300 and suppressing a decrease in torque. .

  Further, in the rotating electrical machine 1 of the present embodiment, the inner rotor 300 is provided with an insulator 340 wound with a coil for each rotor tooth 302, and the holding member 350 is disposed between the insulators 340 attached to the rotor tooth 302. The rotor winding 330 is fixed by injecting a liquid solidified material between the insulators 340 attached to the rotor teeth 302.

  With this configuration, the step of injecting the solidifying agent into the holding member 350 and the step of injecting the liquid solidifying agent into the rotor winding 330 can be performed simultaneously as one step.

  Further, in the rotating electrical machine 1 of the present embodiment, the insulator 340 has a flange portion 342 formed along the outer peripheral surface of the inner rotor 300, and the support portion 352 of the holding member 350 is guided with the flange portion 342 of the insulator 340. The leg portion 351 of the holding member 350 is supported by a slit 304 formed at the bottom of the slot 303 of the inner rotor 300.

  With this configuration, not only the holding force by the solidified material at the leg portion 351 inserted in the gap between the adjacent rotor windings 330 but also the holding force at the outer peripheral surface of the flange portion 342 of the insulator 340 and the induction coil I, the leg The holding member 350 and the rotor winding 330 can be held on the inner rotor 300 by the holding force at the portion 351 and the slit insertion portion 353.

  For this reason, the holding member 350 can firmly hold the insulator 340 and the rotor winding 330 against the centrifugal force, and the rotor winding 330 wound around the insulator 340 is prevented from being displaced due to the centrifugal force. .

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  The rotary electric machine 1 of the present embodiment is an inner rotor type having a radial gap structure, but may be an axial gap structure or an outer rotor structure. Moreover, a copper wire, an aluminum conductor, and a litz wire can be used for each coil. Further, as the magnetic path member 201 and the rotor core 301, an SMC (Soft Magnetic Composite) core, which is a soft magnetic composite material, can be used instead of the laminated electromagnetic steel sheet. The rotating electrical machine 1 can be applied not only to a hybrid vehicle but also to other industrial fields such as a wind power generator and a machine tool.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 1C ... Rotating shaft, 100 ... Stator, 104 ... Armature coil, 300 ... Inner rotor (rotor), 302 ... Rotor teeth (saliency pole part), 304 ... Slit, 330 ... Rotor winding (coil), 340 ... Insulator, 342 ... Hook, 350 ... Holding member, 351 ... Leg, 352 ... Support

Claims (3)

A stator having an armature coil that generates magnetic flux when energized;
A rotating electric machine comprising: a rotor in which a plurality of salient pole portions wound with coils in which the magnetic flux is linked are arranged in the circumferential direction ;
Comprising an insulating paper that will be disposed between the salient poles adjacent each other of said rotor,
The insulating paper has a support part supported on the salient pole part side, and a leg part connected to the support part and supported on the bottom part on the rotating shaft side between the salient pole parts ,
The coil wound around the rotor is fixed by a liquid solidifying material,
The insulating paper is disposed between coils wound around the rotor adjacent in the circumferential direction, and the circumferential side surface and the leg portion of each coil wound around the rotor adjacent in the circumferential direction are arranged by the solidifying material. A rotating electric machine characterized by being fixed . The rotor is equipped with an insulator wound with the coil for each salient pole part,
The insulating paper is disposed between insulators attached to the salient pole parts,
The coil is fixed by injecting the solidified material between insulators mounted on the salient pole parts ,
The insulator has a flange formed along the outer peripheral surface of the rotor,
The supporting portion of the insulating paper, by the solidifying agent, the rotary electric machine according to claim 1, characterized that you have been fixed between the outer peripheral surface of the insulator the coil and the flange portion of the. The leg portion of the insulating paper includes a slit insertion portion that is inserted into a slit formed in a bottom portion of the rotor , and the slit insertion portion is fixed to the slit by the solidifying material. The rotating electrical machine described in 1.

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